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EP2301121B1 - Bougie d'allumage à encombrement optimisé - Google Patents

Bougie d'allumage à encombrement optimisé Download PDF

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Publication number
EP2301121B1
EP2301121B1 EP09779565A EP09779565A EP2301121B1 EP 2301121 B1 EP2301121 B1 EP 2301121B1 EP 09779565 A EP09779565 A EP 09779565A EP 09779565 A EP09779565 A EP 09779565A EP 2301121 B1 EP2301121 B1 EP 2301121B1
Authority
EP
European Patent Office
Prior art keywords
housing part
spark plug
housing
combustion chamber
insulator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP09779565A
Other languages
German (de)
English (en)
Other versions
EP2301121A1 (fr
Inventor
Detlef Hartmann
Andreas Benz
Jochen Fischer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2301121A1 publication Critical patent/EP2301121A1/fr
Application granted granted Critical
Publication of EP2301121B1 publication Critical patent/EP2301121B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/02—Details
    • H01T13/08—Mounting, fixing or sealing of sparking plugs, e.g. in combustion chamber
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/32—Sparking plugs characterised by features of the electrodes or insulation characterised by features of the earthed electrode

Definitions

  • the present invention relates to a space-optimized spark plug with a clamping nut for an internal combustion engine.
  • Spark plugs for internal combustion engines are known from the prior art in different configurations.
  • the spark plug does not have its own thread, but is clamped by a nut in a cylinder head.
  • a spark plug consisting of an insulator, a center electrode and at least one ground electrode known.
  • the spark plug is screwed over the insulator with a nut in a cylinder head. This nut also establishes the ground contact between ground electrode and cylinder head.
  • spark plugs which have a thread on the housing and are screwed into the cylinder head.
  • Modern multi-valve technology increases the intake and exhaust ports, and the close mounting position at the injection valve required for direct injection requires a constant reduction of the installation space for spark plugs.
  • here refers to the space reduction to a reduced diameter of the spark plug.
  • the isolation of the high voltage between the two electrodes requires a minimum wall thickness. This minimum thickness of the insulation precludes the desired diameter reduction.
  • the absence of a thread on the housing of the spark plug opens up opportunities for diameter reduction and consequently for space reduction.
  • a spark plug which has a first combustion chamber closer housing with a larger wall thickness and a second, combustion chamber remote housing part with a smaller wall thickness.
  • a two-part housing is provided, wherein the two housing parts have different wall thicknesses, wherein in particular a thin-walled pipe construction is advantageous.
  • the outer diameter of the spark plug is reduced and the holes in the cylinder head can be reduced, wherein the wall thicknesses of the insulator can be kept equal or possibly increased.
  • the spark plug is further supported by a housing seat surface.
  • a spark plug for an internal combustion engine comprising the following components: a two-part metallic housing with a first housing part, in particular housing seat, and a second housing part, in particular housing tube, a center electrode, a ground electrode , which is arranged on the first housing part, and an insulator to separate the center electrode from the ground electrode.
  • the first housing part is closer to the combustion chamber, ie closer to an eg cylinder of the internal combustion engine, than the second housing part.
  • the first housing part has a housing seat surface for the secure seating of the spark plug in an installed state. Furthermore, a first wall thickness of the first housing part is greater than a second wall thickness of the second housing part. It follows that a cross-sectional area perpendicular to a longitudinal axis of the spark plug of the first housing part is greater than a cross-sectional area perpendicular to the longitudinal axis of the spark plug of the second housing part.
  • the spark plug is characterized in that the spark plug comprises a clamping nut to clamp the spark plug in the cylinder head, wherein the second housing part an increase in diameter, in particular with beads, wherein the increase in diameter represents a shoulder for the clamping nut and / or wherein the diameter magnification of the second housing part and the insulator fixed to each other.
  • the housing seat surface is inclined to the longitudinal axis of the spark plug.
  • the housing seat surface and the spark plug can be centered on the inclined or conical surfaces.
  • the insulator of the spark plug according to the invention is supported on an inner shoulder of the first housing part. It is also advantageous to provide a sealing element on this support surface. Thus, the space between the housing and insulator against the combustion chamber is securely sealed.
  • the insulator may preferably rest on the second housing part, the first housing part also having an inner shoulder here.
  • the second housing part has an inwardly directed combustion chamber facing the end, on which rests the insulator.
  • the inwardly directed combustion chamber nearer end of the second housing part is deformed or reshaped onto the inner shoulder of the first housing part.
  • the sealing surface between the housing and insulator opposite the combustion chamber is formed by the end of the second housing part.
  • the housing seat surface is closer to the combustion chamber than the inner shoulder on the first housing part.
  • the spark plug comprises a clamping nut for axially clamping the spark plug in the cylinder head.
  • the clamping with a clamping nut ensures the sealing between insulator and housing seat and the external tightness between the housing seat and cylinder head.
  • the spark plug is supported by a clamping nut against a housing seat surface.
  • the second housing part has at least one tab, in particular aligned with the ground electrode, at the end remote from the combustion chamber.
  • the tab in particular three tabs, in particular the clamping nut can be prevented from slipping down in the direction of combustion chamber side facing away.
  • the tabs meet here a captive for the clamping nut.
  • the position of the tab is matched with the position of the ground electrode or matches.
  • the ground electrode can be fixed to the tab directed or the tab directed to the ground electrode to be bent.
  • An alignment of the ground electrode in the combustion chamber is possible by simply turning the spark plug.
  • the position of the ground electrode in the combustion chamber can be seen after assembly at the position of the tabs.
  • this match of tab and ground electrode also possible with several electrodes. For example, with three ground electrodes, the position can be displayed via three tabs.
  • first housing part is firmly connected to the second housing part, in particular by means of laser welding. This facilitates the assembly of the spark plug according to the invention and the exact adjustment of the electrode spacing.
  • the second housing part has an increase in diameter, in particular with beads, wherein the increase in diameter represents a shoulder for the clamping nut and / or wherein the increase in diameter fixes the second housing part and the insulator to each other.
  • the first housing part on its side near the combustion chamber comprises an electrode extension, in particular a shoulder, to which at least one ground electrode is attached.
  • the electrode extension for attachment of at least one ground electrode sufficient surface, in particular end face in the radial direction, offer.
  • the second housing part is designed as a sheet metal tube, and / or the first housing part (21) is made as a rotating part.
  • the second housing part is advantageously formed as a sheet metal tube with a wall thickness much smaller than the diameter of the sheet metal tube.
  • Both heat and electrical current are transferred from the ground electrode into the cylinder head via the first housing part.
  • mass can be saved in the region of the second housing part, that is to say in the region remote from the combustion chamber.
  • a thin-walled sheet-metal tube is available for mass and diameter savings, which can also be produced inexpensively.
  • a wall thickness of the first housing part at each position is always greater than a maximum wall thickness of the second housing part.
  • the first wall thickness at the height of the housing seat surface has a maximum value.
  • the first wall thickness is preferably 4 to 5 times larger than a second wall thickness of the housing tube.
  • the second wall thickness of the housing tube is preferably constant. Further preferably, the first wall thickness is always greater than the second wall thickness.
  • FIG. 1 a spark plug 1 according to a first embodiment of the present invention described.
  • the spark plug 1 is mounted in a cylinder head 9.
  • the spark plug 1 comprises a housing 2 having a housing seat 21 (first housing part), a housing tube 26 (second housing part) and a clamping nut 3 and a center electrode 4, a ground electrode 5 and an insulator 6.
  • the spark plug 1 has at its upper end a plug contact 11 and a first cone 13a and a second cone 13b.
  • the plug contact 11 is used for electrical connection of the spark plug 1 with an igniter.
  • the cones 13a and 13b are used to attach the Zündsteckers on the spark plug. 1
  • the housing seat 21 has an annular shoulder 22 and an inner shoulder 23 at its end remote from the combustion chamber. At the combustion chamber facing the end of the housing seat 21, the housing seat surface 24 and the electrode extension 25 is arranged.
  • the annular shoulder 22 serves to insert the housing seat 21 into the housing tube 26 and increases the stability at this connection point.
  • the inner shoulder 23 serves to support the insulator 6 on the housing seat 21. At the same time a sealing point for sealing the space between the housing and insulator against the combustion chamber is formed here. This sealing point is sealed by a sealing element 7.
  • the housing seat surface 24 is conical in the direction of the combustion chamber.
  • the housing seat surface 24 not only takes the clamping force of the clamping nut 3 and forwards it into the cylinder head 9, but also serves to center the spark plug 1 in the cylinder head 9.
  • the housing seat surface 24 with its conical seat-shaped design serves to seal between the combustion chamber and cylinder head 9.
  • the housing seat 21 has at its thickest point, at the upper end of the housing seat surface 24, a maximum first wall thickness D1 (s. Fig. 2 ) on.
  • This first wall thickness D1 is 4 to 5 times greater than a second wall thickness D2 (s. Fig. 2 ) of the housing tube 26.
  • the second wall thickness D2 of the housing tube 26 is constant.
  • the first wall thickness D1 is always greater than the second wall thickness D2.
  • the combustion chamber facing inner bore of the housing seat 21 forms the electrode extension 25 in order to obtain sufficient for the attachment of one or more ground electrodes 5 end face in the radial direction. At the end of this electrode extension 25, the ground electrode 5 is attached.
  • the housing tube 26 In its half facing away from the combustion chamber, the housing tube 26 has a diameter increase 27 with a bead 27a. This is followed by a pipe end 28, in turn, the end of the pipe end 28 is formed to tabs 29.
  • the insulator 6 corresponds at least partially in its outer contour of the inner contour of the housing tube 26 and the diameter enlargement 27. Thus, a connection between the housing tube 26 and insulator 6, in particular in the axial direction, ensured.
  • the clamping nut 3 is held by the bent tabs 29 of the housing tube end 28. Spark plug 1 and 3 clamping nut thus result in a coherent, easy to assemble and disassemble component.
  • the clamping nut 3 presses on the housing tube 26, the insulator 6 in the inner shoulder 23 of the housing seat 21.
  • This housing seat 21 is in turn on the housing seat surface 24 and a corresponding counter-surface 91 (see FIG. 1 ) pressed in the cylinder head 9 in the cylinder head 9 and braced.
  • a biasing force is applied over the clamping nut 3, which is used to seal the insulator 6 on the housing seat 21 and to seal the Housing seat 21 leads to the cylinder head 9.
  • the spark plug 1 does not necessarily have to be gas-tight.
  • the clamping nut 3 has a thread 31 and a tool engagement 32. In the cylinder head 9, a corresponding mating thread to the thread 31 is provided.
  • the considerable advantages of the inventive spark plug 1 over the prior art are achieved.
  • the absence of a thread on the housing 2 opens up the possibility of reducing the diameter of the bore in the cylinder head 9.
  • the separation of the housing 2 in housing tube 26 and housing seat 21 allows the thin tube construction on the side facing away from the combustion chamber of the spark plug 1.
  • the spark plug 1 are rotated in the cylinder head 9 before the final tension.
  • the ground electrode 5 can be made e.g. Align for injection.
  • FIG. 2 Now, a spark plug 1 according to a second embodiment of the present invention will be described below. Identical or functionally identical components are described here with the same reference numerals as in the first embodiment.
  • FIG. 2 shows a spark plug according to the second embodiment in detail, installed in the cylinder head 9.
  • the second embodiment has no seal 7 on the inner shoulder 23.
  • the combustion chamber facing the end 26 a of the housing tube 26 is formed on the inner shoulder 23.
  • the seal is formed here by pressing the insulator 6 onto the housing seat 21 or its inner shoulder 23.
  • FIG. 2 shows the clear difference between the first wall thickness D1 of the housing seat 21, made as a solid rotating part with high stability and the second wall thickness D2 of the thin-walled tube construction of the housing tube 26th
  • the housing seat 21 and the housing tube 26 are connected together.
  • the ground electrode may be secured to the housing seat 21 before or after connection.
  • the attachment takes place directed to the tabs 29 of the housing tube 26.
  • the insulator 6 is inserted into the housing 2.
  • the tube end 28 of the housing tube 26 is formed over a shoulder on the insulator and thereby creates the increase in diameter 27 of the housing tube 26.
  • the tabs 29 are still on the insulator 6 at.
  • the clamping nut 3 is inserted over the insulator 6.
  • the insulator 6 is pressed in the axial direction in the housing seat 21 with a force equal to or greater than the preload force required for gas tightness.
  • the housing tube 26 preferably by radial impression of beads 27 a, plastically deformed. After relieving there is a bias in the housing 2 by the plastic deformation, which fixes the insulator 6 and prevents an adjustment of the electrode gap. By bending the tabs 29 takes a captive fixation of the clamping nut. 3

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (10)

  1. Bougie d'allumage pour un moteur à combustion interne, comprenant :
    - un boîtier métallique (2) avec une première partie de boîtier (21), en particulier un siège de boîtier, et
    - une deuxième partie de boîtier (26), notamment un tube de boîtier,
    - une électrode centrale (4),
    - une électrode de masse (5) qui est disposée sur la première partie de boîtier (21), et
    - un isolant (6) servant à séparer l'électrode centrale (4) de l'électrode de masse (5),
    la première partie de boîtier (21) étant plus proche de la chambre de combustion que la deuxième partie de boîtier (26), la première partie de boîtier (21) présentant une surface de siège de boîtier (24) pour un logement sûr de la bougie d'allumage (1) dans un état monté, et
    une première épaisseur de paroi (D1) de la première partie de boîtier (21) étant plus grande qu'une deuxième épaisseur de paroi (D2) de la deuxième partie de boîtier (26),
    caractérisée en ce que la bougie d'allumage comprend un écrou de serrage (3) afin de serrer la bougie d'allumage dans la culasse,
    la deuxième partie de boîtier (26) présentant une augmentation de diamètre (27), notamment avec des moulures (27a), l'augmentation de diamètre (27) constituant un épaulement pour l'écrou de serrage (3) et/ou l'augmentation de diamètre (27) fixant l'un par rapport à l'autre la deuxième partie de boîtier (26) et l'isolant (6).
  2. Bougie d'allumage selon la revendication 1, caractérisée en ce que la surface de siège de boîtier (24) est inclinée par rapport à un axe longitudinal (X-X) de la bougie d'allumage (1).
  3. Bougie d'allumage selon l'une quelconque des revendications précédentes, caractérisée en ce que la première partie de boîtier (21) présente un retrait intérieur (23), l'isolant (6) reposant contre le retrait intérieur (23).
  4. Bougie d'allumage selon l'une quelconque des revendications 1 ou 2, caractérisée en ce que la première partie de boîtier présente un retrait intérieur (23), et la deuxième partie de boîtier (26) présente une extrémité (26a) tournée vers la chambre de combustion et orientée vers l'intérieur, contre laquelle s'applique l'isolant (6).
  5. Bougie d'allumage selon l'une quelconque des revendications 3 ou 4, caractérisée en ce que la surface de siège de boîtier (24) est plus proche de la chambre de combustion que le retrait intérieur (23).
  6. Bougie d'allumage selon l'une quelconque des revendications précédentes, caractérisée en ce que la deuxième partie de boîtier (26) présente au moins une patte (29), notamment orientée vers l'électrode de masse (5), à l'extrémité opposée à la chambre de combustion.
  7. Bougie d'allumage selon l'une quelconque des revendications précédentes, caractérisée en ce que la première partie de boîtier (21) est connectée fixement à la deuxième partie de boîtier (26), notamment au moyen d'une connexion soudée (8).
  8. Bougie d'allumage selon l'une quelconque des revendications précédentes, caractérisée en ce que la première partie de boîtier (21) comprend sur son côté proche de la chambre de combustion une saillie d'électrode (25) sur laquelle est fixée au moins une électrode de masse (5).
  9. Bougie d'allumage selon l'une quelconque des revendications précédentes, caractérisée en ce que la deuxième partie de boîtier (26) est réalisée sous forme de tube en tôle et/ou la première partie de boîtier (21) est fabriquée sous forme de pièce rotative.
  10. Bougie d'allumage selon l'une quelconque des revendications précédentes, caractérisée en ce que la première épaisseur de paroi (D1) présente une valeur maximale à la hauteur de la surface de siège de boîtier (24).
EP09779565A 2008-07-09 2009-05-28 Bougie d'allumage à encombrement optimisé Not-in-force EP2301121B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008040285A DE102008040285A1 (de) 2008-07-09 2008-07-09 Bauraumoptimierte Zündkerze
PCT/EP2009/056508 WO2010003733A1 (fr) 2008-07-09 2009-05-28 Bougie d'allumage à encombrement optimisé

Publications (2)

Publication Number Publication Date
EP2301121A1 EP2301121A1 (fr) 2011-03-30
EP2301121B1 true EP2301121B1 (fr) 2012-02-08

Family

ID=40897566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09779565A Not-in-force EP2301121B1 (fr) 2008-07-09 2009-05-28 Bougie d'allumage à encombrement optimisé

Country Status (6)

Country Link
EP (1) EP2301121B1 (fr)
JP (1) JP2011527491A (fr)
CN (1) CN102089946A (fr)
AT (1) ATE545183T1 (fr)
DE (1) DE102008040285A1 (fr)
WO (1) WO2010003733A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017117452B4 (de) 2016-08-16 2022-02-10 Federal-Mogul Ignition Gmbh Zündkerze und Verfahren zu ihrer Herstellung

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62167392U (fr) * 1986-04-15 1987-10-23
US4989557A (en) * 1990-04-25 1991-02-05 General Motors Corporation Spark plug assembly for internal combustion engine
US5014656A (en) * 1990-04-25 1991-05-14 General Motors Corporation Internal combustion engine having a permanent ground electrode and replaceable center electrode element
US5091672A (en) * 1990-06-26 1992-02-25 Allied-Signal Inc. Shield for aligning a ground electrode of a spark plug in a cylinder head
DE19500216A1 (de) * 1995-01-05 1996-07-11 Stihl Maschf Andreas Dekompressionsventil
US5535726A (en) * 1995-05-05 1996-07-16 Cooper Industries, Inc. Automotive ignition coil assembly
JPH11329666A (ja) * 1998-05-15 1999-11-30 Ngk Spark Plug Co Ltd スパークプラグ
FR2779014B1 (fr) 1998-05-22 2000-07-28 Sagem Bougie d'allumage pour moteur a allumage commande
JPH11351115A (ja) * 1998-06-12 1999-12-21 Ngk Spark Plug Co Ltd 内燃機関、点火プラグ組立体、シリンダーヘッド、点火プラグ、およびプラグ固定具
JP2003077620A (ja) * 2001-06-20 2003-03-14 Denso Corp スパークプラグおよびその製造方法
ES2235130T3 (es) * 2002-07-22 2005-07-01 Jenbacher Aktiengesellschaft Bujia de encendido.
JP2006012464A (ja) * 2004-06-22 2006-01-12 Ngk Spark Plug Co Ltd スパークプラグおよびそれを備えた内燃機関
DE102006043593B3 (de) * 2006-09-16 2008-04-10 Multitorch Gmbh Zündkerze

Also Published As

Publication number Publication date
WO2010003733A1 (fr) 2010-01-14
EP2301121A1 (fr) 2011-03-30
DE102008040285A1 (de) 2010-01-14
CN102089946A (zh) 2011-06-08
JP2011527491A (ja) 2011-10-27
ATE545183T1 (de) 2012-02-15

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